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Histogram
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This tool displays the histograms of all values corresponding to pixels along a line or within a surface, according to the selection you just did.

In other word, it shows how many pixels have a value of 1,2... etc...

 

You may be prompted to specify minimum and maximum values

 

Using the "List" button, another window appears with a two-column array corresponding to the values of the histogram

Using the "Copy" button, you may then Paste those values into any other data analysis software (spreadsheet for exemple)

 

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